DOOR LOCK PROBLEMS, HOW IS IT CONNECTED?

Toyota Camry

1999 Toyota Camry LE, 170,000 KM 4 cyl.
Where are the plugs for the power door lock mechanism on the front passenger door? The door fails to lock by power but is able to be locked manually. It appears to be a wiring problem but I am unable to figure out how to get to the plugs to check for power.
Thanks